Heater for kilns.



' No. 735,232. PATENTED AUG. 4, 1903.

w. c. MITCHELL.

HEATER EOE KILNS.

APPLICATION FILED JUNE 26, 1902. N0 MODEL.

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UNITED STATES' Patented August 4, 1903.

PATENT OFFICE.

WALTER.` C. MITCHELL, O'EOHIOAGO HEIGHTS, ILLINOIS, ASSIGNOR OE ONE- y HALF TO WALTER `PjGrRATH, OF ST. LOUIS, MISSOURI.

l FOR KILNS.

srnclricn'rronfmnmg page of :Letters Patent No. 735,282, dated August 4, 190e.

l Applicaticn June 26, 19,02. Serial No. 113,221. (No model.)

To all whom, t may concern): l

Be it known that LWALTEP. O.M1ToHELL,a

citizen ofthe United States, and aresident of4 Chicago Heights, county of Oook,State of Illi- 5 nois, have invented a certain new and `useful Improvement in Heaters for Kilns, of which the following is a specification.

My invention relates to the drying of ware" in kilns, and has for vits principal objects to 1o utilize various sources `of heat andguard against excessive variations in the temperature of such sources and to prevent sparks from entering the kiln.

It consists in the construction hereinafter ,y

I5 described and claimed.

In the accompanying drawings,which form part of this specification,and wherein like symbols refer to like parts wherever they occur, Figure'l is a Vertical longitudinal section Fig. 2 is a horizontal section thereof.

My construction comprises a chamber 1, which has an air-inlet opening 2,1ocated in the front thereofnear the top. On the side of said z5 chamber opposite said inlet-opening 2 is an outlet-opening 3, which opens into a chamber 4,which contains a fanblower5,and this chamber has an outlet-flue 6, communicating-with the kiln. Inside of the chamber 1 is a heat-` ge ing-coil 7, forming part ofa suitable steam or4 hot-water, heating system. Preferably thisheating-coil is arranged to utilizethe eX- haust-steam ofthe poWer-plant,andits pipes are staggered in horizontal rows transverse to the direction of the draft. Inside of said chamber 1 and between the heating-coil and the outlet-opening is a wall V8 of open-work Y construction. This wall 8 is preferably made of fire-brick, resting on edge. The brick in 4o each tier are arrangedpara-llel to each other and spaced a slight 'distance apart, but atan angle to the plane of the wall. The brick of each alternate tierare arranged at an angle to those of the adjacent tier. This construction constitutes an open-work baflie construction which permits the free passage of the air, but to a certain extent prevents the solid particles from passing therethrough. During the operation of the device this wall ab- 5o s orbs a considerable amount of heat. So long asthe wall is cooler than the air passing there- .through the air tends to heat the wall; but

whenever the ,temperature of the air falls be` 1 low that ofthe wall .the wall tends to heat such air. In this manner the wall serves to maintain for a long period comparative uniformity of the temperature of the air` passing therethrough. 'Ihe chamber 1 has a second inletl opening 9 therein, located preferably near the bottom of the wall thereof. This second in 6o let-,opening 9 preferably communicates with a iiue 10, which is the outlet-flue for the furnace of another kiln. This second inlet-opening 9 also communicatesJ with a combustionchamber of afurnace 11, preferably arranged in front of said chamber 1. `At the bottom of the chamber 1 is an open-work construction 12, similar to the wall 8, this open-work con struction being arranged in the path-of the products of combustion entering through the 7o opening 9. The front end 13 of this open- Work construction is built upwardly between the front wall 14 of the furnace 11 and the front wall of the chamber 1, so as to be in the direct path of the products of combustion from said furnace 11.` The furnace 1l is provided with an air-inlet flue 15, located above the combustion-chamber and opening into the said furnace at the top of the open-work wall. Said inlet-opening 15 and said inlet-opening` 8o 2 are provided with suitable doors 16 or dampers, and in like manner said flue 10 is provided with a suitable damper. A sheet-iron floor 17 is preferably provided between said heating-coils 7 and said open-work construc- 85 tion 12. Said floor 17 rests upon the top of said open-work construction 12 and extends from said opening 9 to the wall 8 and preferablysupports said heating-coils7. The blower 5 is thus in'communication with three distinct 9o sources of heat, each of which is capable of use without the others. The use of any one heating system, however, heats upA the openwork construction, which continues to radiate the heat for a considerable period `after its source of heat has become inoperative. The open-work construction thus'renders it practicable to utilize such different and variable 'sources of heat as the waste or live y steam of the power-plant and the waste heat Ico of other kilns, as well as a furnace specially provided for use when the other sources of heat are unavailable.

What I claim isl. A heater for kilns comprising a chamber having an inlet-opening on one side and an outlet-opening on the opposite side, a heating-coil in said chamber and an open-work bale construction of great heat capacity between said heating-coil and said outlet-opening, a blower insaid outlet-opening for drawing air through said chamber, an open-work baffle construction of great heat capacity at the bottom of said chamber having an opening communicating with an independent source of heat, substantiallyas described.

2. A heater forkilns comprising a chamber having an inlet-opening on one side and an outlet-opening on the opposite side, a heating-coil in said chamber and an open-Work bafde construction of great heat capacity between sad heating-coil and said outlet-opening, a blower in said outlet-opening for drawing air through said chamber, an open-work baffle construction of great heat capacity at the bottom of said chamber having an opening communicating with an independent source of heat, said open-Work construction extending upwardly in front of said chamber, and a fireplace in front of said open-work construction, substantially as described.

3. A heater for kilns comprising a chamber having an air-inlet opening and an outletopening, a heating-coil in said chamber and an open-Work ba'le construction of great heat capacity between said heating-coil and said outlet-opening, a blower in said outlet-opening for drawing air through said chamber, an open-Work baffle-Work construction of great heat capacity at the bottom of said chamber, said chamber having an opening communieating with van independent source of heat, said open-Work construction extending upwardly in front of said chamber, a fireplace in front of said open-Work construction and a cold-air Hue above said fireplace, substantially as described.

W. C. MITCHELL.

1n presence of- ZoLA TUCKER, T. PERCY CARR. 

